针对连云港港区25万吨级进港航道回淤总量小于15万吨级的现象，从航道回淤实测资料、工程前后水动力环境等入手，借助于潮流数学模型，研究了该现象产生的原因。研究结果表明：疏浚工程和环抱式防波堤工程均会对进港航道的回淤产生一定的影响，但防波堤的影响起主要作用。疏浚工程导致航道流速以减弱为主，因而使得航道回淤略有增加；而环抱式防波堤工程，将使口门附近流速显著增加，从而导致进港航道回淤大幅减小。此外，环抱式防波堤的掩护作用，在很大程度上阻挡了泥沙进入港区，从而使口内航道段回淤也大幅降低。%To counter the phenomenon that the total siltation in 250 000 DWT approach channel at Lianyungang area is less than 150 000 DWT, we probe into the cause for it based on the analysis of the actual measured data about channel siltation and dynamic environment of water and sediment before and after engineering by the flow mathematical model. The result indicates that both dredging engineering and encircle breakwater engineering will have impacts on silting of the approach channel, but the breakwater is more essential. Dredging engineering mainly makes the flow rate of the channel slow down and hence it slightly increases the channel siltation;encircle breakwater engineering makes the flow rate near the entrance increase significantly so that the approach channel siltation reduces sharply. In addition, the protective effect of the encircle breakwater prevents the sediment from entering the port and then the siltation of inner fairway section also decreases in a large scale.
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